LIST OF PLATES. 
PLATE I. 
APPARATUS FOR MAKING PHoto-MicrocraPHs, 1. Heliostat, 
to be placed on shelf outside of window. 2. Tube, to be 
placed in darkened window, having eight-inch lens at outer 
extremity, and ammonio-sulphate of copper cell at inner 
extremity. 3. Microscope. 4. Frame containing ground- 
Glass SCreGM. 2. Ss BGs aR ag . Frontispiece. 
PLATE II. 
To FACE PAGE 
Fie. 1. Amcapa, from standing water, New Orleans, 1880 ; 
magnified six hundred diameters . . toes . 126 
Fig. 2. Micrococcr in blood of rabbit ; magni one Siow 
sand diameters i 2 . 126 
Fig. 3. Muicrococcr from urine ; inperitio® one eiomeand di- 
ameters . . . he tae) tk » 126 
Fig. 4. AMGBA PROTEUS; “Magnified bins nuded dibehactans - 126 
PLATE III. 
Fie. 1. Uniceniunar Axa@a, from stagnant, water, New Or- 
leans, 1880 ; magnified four hundred diameters . . . 143 
Fie. 2, Eveiena viripis, from surface of moist mud, New 
Orleans, 1880 ; magnified two hundred diameters . . 143 
Fie, 3. Spores or Funeus (Penicillium); magnified four 
hundred diameters... . 143 
Fie. 4. Bacterta from solution: of fclvesletines ; "gatas ex- 
periment, New Orleans, 1880; magnified one thousand 
GIAMIEERS): oe ee dS er a en See TS 
